A criss-cross pattern similar to one I saw mown into a sports field.
Source Firkin
Seamless Prismatic Pythagorean Line Art Pattern No Background. A seamless pattern that includes the original tile (go to Objects / Pattern / Pattern To Objects in Inkscape's menu to extract it).
Source GDJ
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
One more updated pattern. Not really carbon fiber, but it’s the most popular pattern, so I’ll give you an extra choice.
Source Atle Mo
A free repetitive background with a dark concrete wall like texture. This one may be used in dark web site designs.
Source V. Hartikainen
I have no idea how to describe this one, but it’s light and delicate.
Source JBasoo
From a drawing in 'Hubert Montreuil, or the Huguenot and the Dragoon', Francisca Ouvry, 1873.
Source Firkin
The base gradient edited so now more details are rendered.
Source Lazur URH
Seamless pattern formed from a tile that can be extracted by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
A very slick dark rubber grip pattern, sort of like the grip on a camera.
Source Sinisha
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
A bit like smudged paint or some sort of steel, here is scribble light.
Source Tegan Male
Not the Rebel alliance, but a dark textured pattern.
Source Hendrik Lammers
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Love me some light mesh on a Monday. Sharp.
Source Wilmotte Bastien
Background Wall, Art Abstract, Block Well & CC0 texture.
Source Ractapopulous
Black brick wall pattern. Brick your site up!
Source Alex Parker